<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>实现一个计算器</title>
</head>
<body>
    <h1>计算器</h1>
    <form action="calc" method="get">
        num1 : <input type="text" name = "num1">
        num2 : <input type="text" name = "num2">
        <input type="submit">
    </form>
</body>
</html>